The Dracaena, family of the Dragonblood tree from Madagascar. This is probably the Dracaena marginata var. Tricolor but I am not sure.
The plant is at least 25 years old, survived three years on an attic with hardly any water, and was without any leaves. Since beginning of last year I spend more attention to it, and now it's flourishing again.
D200 - AF Nikkor 200/3.5